Could be the bulb. Could also be the switch at the base of the shift lever.
Could also be an open wire somewhere in between. I'd say call it good!

"STONECREED" <vze1nksx@verizon.net> wrote in message
news:1115736444.621786.120930@f14g2000cwb.googlegr oups.com...
> Yes..I bought the car used a few months ago..when I first got it..the
> D4 light would not illuminate...after a 3 months its suddenly come on
> when driving in D4...was it just the bulb?
>